'Myrtle' in the Bible

I was attentive that night and saw a man seated on a red horse that stood among some myrtle trees in the ravine. Behind him were red, sorrel, and white horses.

Then the man standing among the myrtle trees spoke up and said, "These are the ones whom the Lord has sent to walk about on the earth."

The riders then agreed with the angel of the Lord, who was standing among the myrtle trees, "We have been walking about on the earth, and now everything is at rest and quiet."